2007 revving up ICE when off throttle or coming to a stop. HELP!

First off, I know this might be off topic or not the correct forum but I tried posting this issue in the technical forum previously.
Recently purchased a 2007 (not sure what submodel) with around 170k miles. Not sure of the vehicle maintenance prior to my purchase but I do know that the 12V battery has been recently replaced and I've had it deep cycled and load tested.
My problem is that when the car starts it runs fine for about 20-30 seconds then proceeds to rising the RPMs of the ICE to around 2500. I know this because it is audibly louder and I verified through my OBD II. When the vehicle slows down, it has a hard time ever going to into EV mode and 95% of the time it starts revving the ICE until the throttle from the pedal is engaged. It doesn't only do it when the car is warming up either. It does this at all times no matter the temperature, no matter how long it's been running, no matter what accessories are on including climate control or A/C. It's not throwing ANY codes through OBD and I'm at whits end with trying to figure out what is going on with this car. I've seen similar threads about this issue but I can't find updates or fixes. I've also replaced the MAF, air fitler and cleaned the throttle plate and body. HELP!!

 

The issue is the same in neutral and the system shows plenty of bars of hybrid charge while the issue persists.

I haven't checked the fuel trim values quite yet but plan to before the end of the day.

I'm hoping its a throttle body issue as apposed to a hybrid battery issues...

Thanks for the reply

 

Is there a way to re-calibrate the system without taking it to a dealer?

No lights currently on the dash. What codes other than the OBD engine codes might I be looking to get scanned?

I'm unfamiliar with the throttle assembly control switch. I've done some research but can't find much about that, could you expand just a bit on that component and its exact location? Thanks

 

Thanks for replying, I'll look into disconnecting the battery again. I did not even think about it affecting the drive by wire sync while being connected to the battery.

Did you experience the car not wanting to switch into EV Mode while this issue was occurring? It seems to want to rev up at almost every stop and its frustrating in traffic.

 

Ok Ill, have the car read again by a separate scanner. I'll disconnect the battery again when I get home to see if this will help relearn the idle issue.

I see what you are talking about now. I hope that isn't the case but I wouldn't rule out the control switch as being a possible cause.

I have tried cleaning the throttle plate itself, not the entire assembly though. I might try that next but I need to buy a throttle body gasket to be on the safe side.

 

UPDATE: Car threw a P0505 code during lunch.

 

Also wanted to add that when originally cleaning the throttle plate I attempted to remove the throttle body as a whole and accidentally removed the position sensor (I believe) I tried to reinstall it as close to factory as possible.

Could this be causing the issues? Is it also able to be recalibrated or adjusted?

 

I adjusted the sensor to the best of my ability to right around .5V at idle after the car had warmed up (coundn't find the exact spec) AND pulled the negative lead from the 12V battery for about 20 mins. Initially the car ran perfect, drove it around my neighborhood around 20 mins making plenty of stop and goes. Unfortunately, about six blocks away from my house the car started acting up again having the exact same rev problems as before...

I parked the car and am back at the drawing board. I'm going to wait until it will throw a code again and try reviewing the freeze frame data from the OBD as the PDF suggested. Thanks for posting that BTW, is there anyway I could see that document in full?

 

UPDATE:

I checked all the induction and vacuum hoses for leaks, found slight cracks near the connectors. So I replaced those and the connectors, along with a complete throttle body (including throttle motor and position sensor). Disconnected the battery again while replacing these components, and voila! Car has been running smooth as can be expected with the miles it has on her. Thank you to everyone who helped narrow down the idling issues I was having!